fix appveyor 32-bit windows build
I've backed rebased under #297 because AppVeyor has been failing since there, and because that was not properly based on master anyway.
* http://help.appveyor.com/discussions/problems/2229-v140-not-found-on-vs2105rc
```
Done Building Project "C:\projects\jsoncpp\jsoncpp.sln" (default targets) -- FAILED.
Build FAILED.
"C:\projects\jsoncpp\jsoncpp.sln" (default target) (1) ->
"C:\projects\jsoncpp\ALL_BUILD.vcxproj.metaproj" (default target) (2) ->
"C:\projects\jsoncpp\ZERO_CHECK.vcxproj" (default target) (3) ->
(PlatformPrepareForBuild target) ->
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.Cpp.Platform.targets(64,5): error MSB8020: The build tools for v140 (Platform Toolset = 'v140') cannot be found. To build using the v140 build tools, please install v140 build tools. Alternatively, you may upgrade to the current Visual Studio tools by selecting the Project menu or right-click the solution, and then selecting "Upgrade Solution...". [C:\projects\jsoncpp\ZERO_CHECK.vcxproj]
```
When I arrived at the JsonCpp GitHub page, as an intermediate C++ developer, I could not figure out how to include JsonCpp into my project. The changes I propose to the README make this much clearer, and define a clear distinction between which instructions are for those developing and contributing to JsonCpp, and those who are just using it.
Do not prepend ${prefix} to substituted includedir & libdir
in the pkg-config file -- if the paths are overriden by user, CMake puts
absolute paths there (even if user specifies a relative path). Instead,
use the absolute path provided by CMake and appropriately default
LIBRARY_INSTALL_DIR & INCLUDE_INSTALL_DIR to absolute paths with
${CMAKE_INSTALL_PREFIX} prepended.
Fixes: https://github.com/open-source-parsers/jsoncpp/issues/279
Signed-off-by: Michał Górny <mgorny@gentoo.org>
fix compile error on android
But note that we do not have continuous integration testing for Android. This could break again.
`snprintf` drives me crazy. It should have been part of every C library 20 years ago.
Use standard **cmake** variables, to support superprojects better.
- `JSONCPP_LIB_BUILD_SHARED` -> `BUILD_SHARED_LIBS`
- `JSONCPP_LIB_BUILD_STATIC` -> `BUILD_STATIC_LIBS`
Currently JSONCPP_LIB_BUILD_SHARED variable is used as option to build static/shared libraries.
The current patch uses standard CMake variables for this.
Such a workaround is done in https://github.com/open-source-parsers/jsoncpp/issues/51
Current patch will make it generic.
New `appveyor.yml`: All tests pass, in both Appveyor and Travis!
Henceforth, GitHub will run both for any pull-request, so this file will be needed in the `0.y.z` branch too.
